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RANDLEMAN, N.C. -- A disgruntled North Carolina grandmother opened fire in a Wal-Mart parking lot Thursday afternoon, injuring only herself, according to police.

The incident, which happened about 3 p.m., store, apparently stemmed from a custody battle. That morning, a judge granted custody of a 2-year-old to the child's father, not the grandmother, police said.

The father and grandmother -- neither of whom have been identified by police -- arranged to meet at the Wal-Mart parking lot so the father could pick up the child. Instead, police said, the grandmother showed up with a gun and opened fire.

Neither the father nor any shoppers were injured in the shooting.

The grandmother accidentally shot herself in the foot and drove off. Police apprehended her a short time later.

She is being treated in an area hospital. Charges are pending as of Thursday evening.